Questions tagged [torque]

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Need to limit the torque on a spooler

I'm a newbie to DC motors. I'm trying to use a geared DC motor of 150RPM 70Ncm torque to pull in rope on a small spool. The rope is being released by other equipment. This rope is being released at ...
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1 answer
58 views

How to calculate torque constant and back EMF constant of a BLDC motor?

I have a BLDC motor to run for a fan. The parameters are as follows: Electrical frequency measured: 61.936 Hz Pole pairs: 8 Line voltage measured: 70.365 V RMS Line voltage peak: 99.51113732 ...
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0 votes
2 answers
61 views

How is power consumed by an induction motor calculated based on speed (from a VFD) and torque induced by the rotor shaft?

I've been tasked with carrying out some design improvements on my company's production floor. There is a flat belt conveyor assembly line, whose movement forward movement is controlled by a single ...
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1 answer
42 views

How to check for the specification of the motor to lift a certain weight? [duplicate]

I'm trying to figure out how much power, torque and rpm required for a motor to carry 2-3 kg (including his own weight). Also, the speed at which the weight is lifted doesn't really matter as much as ...
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1 vote
0 answers
105 views

How to obtain torque constant for stepper motor?

I want to measure the torque constant of a stepper motor but seems I am doing it wrong. I have an MST342C02 stepper motor (200 step/rev and 4 phases) with SMD42C2 Driver. I have a converter that gives ...
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how do i increase torque of leadshine ES-DH2306 servo motor (hybrid motor)?

i am using leadshine ES-DH2306 servo motor it is also called as hybrid motor. the torque of this motor is 20Nm. but when we are giving the load around 7 Nm it is failing.it is giving lots of jerke. ...
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0 votes
3 answers
115 views

Small brushless motors: What are the inherent trade-offs between 56V and 18V motors? [closed]

While researching tools in the quest to become a handyman, I was captivated by the fact that one of the top brands sells 54V (60V max) cordless power tools while another sticks to 18V. Two questions ...
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3 answers
79 views

Stepper motors both rated for higher current but the NEMA 23 stops and the NEMA 17 keeps going, could it be a (hardware) low quality motor issue?

I am using the DRV8825 stepper motor driver. The NEMA 17 is rated for 1.2 A and the NEMA 23 I'm using says it's rated for 2A. I have two NEMA 23s and they both soon choke out (stop moving). When I was ...
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Q: Motor sizing for reeling application

I would like to ask for some help. My application is regulation of vertical speed of the camera, which is mounted on winding/unwinding reel. The camera follows the object (which moves vertically). The ...
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4 votes
1 answer
124 views

Motor torque control with PWM : how to measure current?

For my caving robot project, I have 8 motors for which I need torque control (they will mainly be stalled or nearly stalled.) Each motor is driven by a DRV8801PWPR H-bridge (commanded by one digital ...
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1 answer
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Get high torque out of stepper motor

I have a project where I need to lift about 2 kg about 15 cm above the ground with a stepper motor. I understand the holding torque can be calculated force times distance. So that would give me ...
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What type of motor should I use in a conveyor and how should I design it?

I need to motorize the following conveyor : It consists of 2 rolls and 9 round belts. The length L is 50 cm, the width l is 20 cm and the rolls have a radius r of 3 cm. Only the first roll will be ...
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0 answers
42 views

Haptic feedback from DC motor

I want to make a simple lever connected to a DC motor pressing down on surfaces with different rigidities. I will control the lever up and down to the same position while observing the torque (or ...
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1 vote
4 answers
204 views

How can power in a DC motor increase when current decreases?

In many graphs for DC motor torque speed power and other characteristics we can clearly see that as the speed of the motor increases the torque decreases, because back emf increases and torque depends ...
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1 answer
58 views

How to find BLDC motor power and torque rating with torque constants and other given parameters

I am currently working on simulating a solar pv fed bldc motor in simulink software. I have the datasheet values of bldc motor from a iet journal as Number of poles, P = 6; rated speed, Nrated = 3000 ...
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0 votes
1 answer
58 views

What happens to the permanent magnet flux of this synchronous motor?

Considering a synchronous motor with permanent magnets (1 pair) If there is a synchronous motor with permanent magnets and I was given the initial permanent magnet flux Y_mp = e0(at 15 rps) / w (at 15 ...
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1 vote
2 answers
87 views

What is this torque I am measuring?

I have a small brushless motor running at 3 V and a cardboard disc (about 5.5 cm radius, 3 mm thick) which can be attached and detached from the shaft of the motor. When the disc is not attached the ...
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-1 votes
2 answers
62 views

How can I find the torque of a DC 6V brushed motor in a hair trimmer? [closed]

How to find hair trimmer motor start torque and power for a DC 6V 6000 RPM motor?
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2 votes
2 answers
128 views

DC motor: why is torque NOT DEPENDENT on the angle of rotation?

I am reading a book on control systems where they take an example of an armature controlled DC motor. Because the goal is to describe constructing a block diagram from the system equations, the ...
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0 votes
1 answer
90 views

Will reducing the back EMF on a running motor increase its torque? [closed]

Will placing a diode across a DC motor after it has started running reduce or even remove the back EMF to allow the motor to achieve higher torque at higher RPMs? I know the motor will begin heating, ...
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0 votes
2 answers
82 views

How are real-time speed and torque of a brushless DC motor computed?

Let's suppose I need to work with a three-phase brushless DC motor. The DC motor has only three wires to control its 3 phases, there is no other wires (no Hall effect sensor return for example). ...
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1 vote
2 answers
65 views

3 phase electric motor torque output

I am a mechanical engineer and fairly new to real life usage of electric motors. I have a 2.2 kW 3 phase AC motor. At 1450 rpm, it can generate 14.49 Nm torque (I understand this is called nominal ...
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1 vote
1 answer
115 views

Motor torque sensing via current with PWM driver

What is the correct way to do torque sensing on a DC motor being driven by a PWM driver? For a constant current it's assumed that torque is roughly proportional to current but in the case of a PWM ...
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-2 votes
1 answer
53 views

What is the effect on speed and power when we connect three motors on a single shaft? [closed]

Rolls Royce used three 750R (YASA) motors in their aircraft "Ionbird." All motors are mounted on the same propeller shaft. What is the effect on the overall speed and power of the motors? ...
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0 votes
1 answer
63 views

How much weight can this DC motor and wheel combination carry? [closed]

I'm trying to make a RC Car with a total weight around 1kg. It will be 4-wheel drive with differential drive algorithm. The count of motors will be 4 DC motors simply. I have chosen the following ...
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0 votes
2 answers
40 views

Motor controller structure for constant torque starting and then switching to constant speed

I need to design a field-oriented-control (FOC) controller for a permanent magnet synchronous motor (PMSM) with position sensor. In the starting process where the motor goes from zero speed to rated ...
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0 votes
3 answers
37 views

How to power (from AC) & set varying overcurrent limits on the fly for 12 V DC motor

I am trying to use a 12 V geared down (high torque, low speed) motor in an exercise application. I want to be able to roughly adjust the load akin to adding more physical weights on a traditional ...
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0 votes
1 answer
88 views

DIY Ebike BLDB motor controller, low torque, is it my motor?

I've designed a 3 phase inverter for driving a BLDC hub motor. The design (if anyone wants to look at schematics, is here). This works well, the motor spins up and down fine, no worries. However, if I ...
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4 votes
4 answers
698 views

Can I use stall torque to calculate torque constant?

I'm using torque control for my project, and dc motor manufacturer doesn't give me the number of their motor's torque constant and motor resistance. I can use multimeter to measure the motor's ...
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0 votes
3 answers
280 views

How can this BLDC motor have constant torque over its RPM range?

I was going through this catalogue of BLDC motors for my EV project. I found two motors in it, one rated at 2.5 kW of peak power, and the other 6 kW of peak power. My questions are as follows: It is ...
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0 votes
0 answers
38 views

Torque developed by Star Connected rotor

The current in each phase of a Y-connected rotor winding is 200 amperes. The resistance per leg is 0.003 ohm. Determine the torque developed by the rotor at a slip of 3%. I don't understand how to ...
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-1 votes
1 answer
51 views

Motor power, torque and RPM importance (simulator steering wheel) [closed]

I would like to build a DIY racing simulator steering wheel very similar to this one. My question is, how will the specifications of the motor used affect the experience at the wheel after the pulley ...
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0 votes
1 answer
68 views

How to determine if a motor will be powerful enough to drive a drift trike

I am planning on building a drift trike and I am trying to work out the best motor to use that is right for my budget. I have seen: a 2000w (48v - 4300RPM - 4.44 N.m torque) a 1000w (48v - 3000 RPM -...
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5 votes
3 answers
549 views

About the torque-free charging operation

I and one of my friends are working on understanding the below context (paper link): The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on ...
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0 votes
0 answers
43 views

Why don't I get a bell curve in the torque vs rotor position plot?

I have designed a inset PMSM. I tried to plot the torque vs. rotor position plot but I am not getting a bell curve. Like at the torque must be maximum only when theta is 90 degrees. I don't know where ...
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0 votes
3 answers
134 views

Is it best practice to use motor drivers that supply continuous current greater than the stall current of the motor?

Note I am a beginner :) I have this 300RPM motor: https://uk.banggood.com/CHIHAI-MOTOR-GM25-370-DC-Gear-Motor-6V-100210300RPM-Encoder-Motor-p-1016183.html?cur_warehouse=CN&ID=519629&rmmds=...
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1 vote
2 answers
83 views

Underwater train project's battery powered DC/BLDC/Stepping motor gear/non gear requirements and water proof sealing problem

I am a software developer by trade, having put together a few beginner Arduino projects and such. My next project entails an underwater roller-coaster (without loops, just going over the surface, so ...
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2 answers
40 views

TRT-25 and Arduino Uno

I need help on a project I am working on. We are trying to integrate a reaction torque sensor and I am having a hard time deciding how to go about it. Previously I assumed that like my load cell I ...
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-1 votes
1 answer
95 views

Does "rated torque" (kg.cm) directly apply to "lead screws"? [closed]

I am making a project that requires driving nuts through threaded rods. I keep seeing different numbers for kg.cm and N.m, the explanation kg.cm found on this Stack emphasized only on radial distance, ...
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1 vote
2 answers
285 views

DC Motor, Torque vs RPM

I am making a pulley system (for an electric bike) that requires about 300rpm and 40lb-inch torque. The motor that I am looking at is a 24V DC Permanent Magnet Electric Motor Generator 250W 2750RPM ...
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1 vote
2 answers
168 views

In absence of leakage, what creates the angle between stator and rotor flux in an induction machine?

As per my understanding to produce torque from a machine, we need an angle between stator and rotor flux. In an induction machine rotor flux is created in response to stator flux, why is there an ...
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0 votes
2 answers
164 views

How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh?

I am working on a 100 kWh capacity gravity battery bank. How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh? How many kWh would it take to lift the ...
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0 votes
2 answers
86 views

Measure torque with a BLDC motor

I'm trying to build a bench test in order to measure the torque required to put and keep in rotation a brake which function with friction. The rotational speed for this test is slow (15 RPM) to be ...
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0 votes
1 answer
105 views

How is the feedback estimated in the torque mode control of a servo motor?

The torque mode control of a servo motor requires the feedback of the current torque generated by the motor in order to compare it against the torque reference signal. Is the product \$K_t I\$ of the ...
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0 votes
0 answers
38 views

Is torque constant times the motor current the only way to estimate torque feedback in a servo motor?

Consider a torque and position tracking servo motor. Once the motor reaches the target position (assume no external torque applied), the end effector should apply a torque which tracks the torque ...
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0 votes
2 answers
100 views

What happens when the motor torque is constant and the load torque suddenly decreases?

It is a situation where the load torque (Ta) suddenly decreases while rotating the shaft with a motor(PMSM) at a constant motor torque (Tm). In my opinion, the rotational speed of the shaft (I-moment ...
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0 votes
1 answer
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Accurate Static Pulling (with electric motor?)

I am trying to see if I could accurately apply a static pull to a cord to create tension. I should not be measuring the tension directly, only be sure that the pull I apply is the force in Newtons ...
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1 vote
0 answers
49 views

Is it possible to regulate the amount of counter torque in a generator?

I have a question for a machine I am working on, The machine is used to pre-tension steel wire ropes for maritime uses, the wire rope sits on a drum with a 2m diameter. The tension has to be ...
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0 votes
1 answer
151 views

Torque Control of DC fan using Arduino

I am trying to control the torque of a 24V-DC fan (datasheet) using an arduino. A control system with feedback must be setup to continuously check the torque of the motor and correct it, if the value ...
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0 votes
1 answer
88 views

finding the right torque and motors

I am trying to find the right motors for the following case: I want to have a total of two motors on opposite sides of a board. The board will have a maximum weight of 150kg (330 lbs) and needs to ...
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